About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Advances in Refractory High Entropy Alloys and Ceramics
|
| Presentation Title |
Selective laser sintering and spark plasma sintering of compositionally complex carbide ceramics |
| Author(s) |
Bai Cui, Lanh Trinh, Xin Chen, Luke Wadle, Yongfeng Lu, Zilong Hua, Kaustubh Bawane , Linu Malakkal, Lingfeng He |
| On-Site Speaker (Planned) |
Bai Cui |
| Abstract Scope |
Two advanced manufacturing processes, spark plasma sintering (SPS) and selective laser sintering (SLS), have been developed for synthesis of (Zr,Nb,Ta,Ti,W)C compositionally complex ceramic (CCC) via reactive sintering of a powder mixture of constitute monocarbides. X-ray diffraction analysis confirmed that single-phase CCC can be formed by both SPS and SLS. While a homogenous microstructure with uniform metal element distributions was developed during SPS, three-layer microstructures with a thin TiC-rich layer and two TaC-rich layers along with a TiO2-rich surface layer containing W nanoparticles were formed during SLS. Cellular structures with W, Zr, and Ti element segregation and dislocations on cell boundaries were observed in the SLSed CCC sample, indicating the effect of non-equilibrium conditions on microstructure formation during laser melting followed by rapid cooling and solidification process. Compared to the SPSed CCC sample, the SLSed CCC showed enhanced hardness and reduced thermal conductivity, which may be related to unique cellular structures. |